Polarized electronic Raman scattering studies of underdoped and overdoped high-{Tc} superconductors
The authors report on polarized Raman scattering from high-{Tc} superconductors in the Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}} (Bi2212) and HgBa{sub 2}CuO{sub 4+{delta}} (Hg1201) classes, with an emphasis on the effect of superconductivity on the low frequency electronic continuum. The Hg-based materials confirm earlier observations from Bi2212 that the superconducting energy gap 2{Delta} peak is not present in underdoped samples, while its Raman shift is maximum in B{sub 1g} symmetry at optimal doping, and decreases dramatically with overdoping. These similarities despite the different numbers of bands crossing the Fermi surface argues against a multiple-band explanation for the anomalous doping dependence of the gap. They also discuss an anomalous B{sub 1g} feature observed at 600 cm{sup {minus}1} in Y underdoped Bi2212. This pseudogap-like feature has several properties which suggest it is of electronic--rather than phononic--origin.
- Research Organization:
- Naval Research Lab., Washington, DC (US)
- OSTI ID:
- 20015263
- Journal Information:
- Journal of Low Temperature Physics, Vol. 117, Issue 5-6; Conference: International Conference on Physics and Chemistry of Molecular and Oxide Superconductors, Stockholm (SE), 07/28/1999--08/02/1999; Other Information: PBD: Dec 1999; ISSN 0022-2291
- Country of Publication:
- United States
- Language:
- English
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